Hotels in Leeds city centre
The Leeds Railway Station and The Brewery Tap (the venue for the pre-conference get together) are both situated in Leeds city centre. There are many hotels in the area; find some examples here.
There are some Airbnb options in the area, which can offer good value.
Claytons Hotel is a 10 minute walk from the station and on the bus route to the conference venue. There is a 10% discount on hotel rooms here if you ring and say that you're attending a conference at Leeds United Football Club: http://www.claytonhotelleeds.com/